Re: [hylafax-users] Repairing partially received faxes

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Charles Duffy wrote:

> I'm using tiff2pdf to convert incoming TIFF files to PDF. This works 
> great -- except when the incoming fax job is interrupted. When this 
> happens, tiff2pdf aborts with output which doesn't constitute a valid 
> PDF, and I'm still trying to work out a way to recover as much of the 
> job as possible.
>
> My initial thoughts were to use tiffsplit to split out valid pages and 
> tiffcp to rebind them into a single document before running through 
> tiff2pdf; however, tiffcp does not appear to accept JBIG-encoded 
> input, even with libtiff 3.8.2 with JBIG support (as patched in by the 
> current Gentoo ebuild):
>
> $ tiffcp -c none /tmp/fax673.split* /tmp/fax673.recombine.tif
> /tmp/fax673.splitaaa.tif: ISO JBIG scanline decoding is not implemented.
> /tmp/fax673.splitaaa.tif: Error, can't read scanline 0. 


I do the tiffsplit + tiffcp approach to filter and clean-up all received 
faxes on many of my production systems.  It should work fine for you 
with JBIG, too.  Make sure that you patched tiffcp with the following as 
part of your patching...

diff -Nru tiff-3.7.2.orig/tools/tiffcp.c tiff-3.7.2/tools/tiffcp.c
--- tiff-3.7.2.orig/tools/tiffcp.c      Fri Jul 22 08:54:47 2005
+++ tiff-3.7.2/tools/tiffcp.c   Fri Jul 22 08:54:57 2005
@@ -349,6 +349,8 @@
               if (cp)
                       defpredictor = atoi(cp+1);
               defcompression = COMPRESSION_DEFLATE;
+       } else if (strneq(opt, "jbig", 4)) {
+               defcompression = COMPRESSION_JBIG;
       } else
               return (0);
       return (1);
@@ -647,6 +649,12 @@
       case COMPRESSION_JPEG:
               TIFFSetField(out, TIFFTAG_JPEGQUALITY, quality);
               TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, jpegcolormode);
+               break;
+       case COMPRESSION_JBIG:
+               CopyTag(TIFFTAG_FAXRECVPARAMS, 1, TIFF_LONG);
+               CopyTag(TIFFTAG_FAXRECVTIME, 1, TIFF_LONG);
+               CopyTag(TIFFTAG_FAXSUBADDRESS, 1, TIFF_ASCII);
+               CopyTag(TIFFTAG_FAXDCS, 1, TIFF_ASCII);
               break;
       case COMPRESSION_LZW:
       case COMPRESSION_DEFLATE:

You may also need this patch to tiffsplit:

--- tools/tiffsplit.c.orig      2005-10-28 14:46:55.512161808 -0700
+++ tools/tiffsplit.c   2005-10-28 14:48:23.411799032 -0700
@@ -191,6 +191,13 @@
       CopyField(TIFFTAG_HOSTCOMPUTER, stringv);
       CopyField(TIFFTAG_PAGENAME, stringv);
       CopyField(TIFFTAG_DOCUMENTNAME, stringv);
+       CopyField(TIFFTAG_BADFAXLINES, longv);
+       CopyField(TIFFTAG_CLEANFAXDATA, longv);
+       CopyField(TIFFTAG_CONSECUTIVEBADFAXLINES, longv);
+       CopyField(TIFFTAG_FAXRECVPARAMS, longv);
+       CopyField(TIFFTAG_FAXRECVTIME, longv);
+       CopyField(TIFFTAG_FAXSUBADDRESS, stringv);
+       CopyField(TIFFTAG_FAXDCS, stringv);
       if (TIFFIsTiled(in))
               return (cpTiles(in, out));
       else

I've not yet tried libtiff-3.9.0, but these changes are *supposed* to be 
in there.  I'm currently still using 3.7.2 everywhere I need JBIG or 
JPEG support.

Thanks,

Lee.


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